Shure-SR109 mixer 电路图.pdf

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1、SR109 Professional Mixer OPERATION AND SERVICE MANUAL Manufactured by SHURE BROTHERS INC. 222 Hartrey Avenue Evanston, Illinois 60204 U.S.A. WARNING To reduce the risk of fire or electric shock, do not expose this appliance to rain or extreme moisture. Copyright 1979, Shure Brothers Inc. 27A1413 (SG

2、) Printed in U.S.A. RadioFans.CN 收音机爱 好者资料库 SR109 Professional Mixer SPECIFICATIONS Equipment Type . . . . . . . All silicon transistor mixer/pre- amplifier Number of lnput Channels . . . . . . 8 Power Output . . . . . . . . . +19 dBm (program line level) Voltage Gain * Program . . . . . . .87 -13 d

3、B MIC input to LlNE - LEVEL out 37 -+3 dB LlNE input to LlNE LEVEL out 37 -13 dB MIC input to MIC LEVEL out Headphones . . . .69 -13 dB MIC input to PHONES out Link . . . . . . . . . .54.5 k 3 dB MIC input to LlNK OUTPUT (with 600-ohm termi- nation) 27 k 2 dB LlNK INPUT to LlNE LEVEL output Accessor

4、y . . . . . .59 t 3 dB MIC input to ACCES- SORY output (via pins 1-8/IN- PUTS) 54.5 k 3 dB MIC input to AC- CESSORY output (via pin 9/PROGRAM) (terminated with 600 ohms) Frequency Response . . . k 3 dB, 20 Hz-20 kHz (150-ohm source; 600-ohm load) lnput Sensitivity . . . . . . .0.1 mV max. for +4 dBm

5、 program output Distortion . . . . . . . . . . . .THD less than 1% at +12 dBm, 30 Hz-20 kHz; IM distortion less than 1% at +12 dBm Noise (300 Hz-20 kHz) . . . . . - 128 dBV (equivalent input noise at full gain) -72.8 dBm output noise (MAS- TER Volume Control down) -38.8 dBm output noise (MAS- TER an

6、d one channel Volume Control up) Hum and Noise (20 Hz-20 kHz) . . . . . . - 125 dBV (equivalent input hum and noise at full gain) -61.8 dBm output noise (MAS- TER Volume Control down) -34.8 dBm output noise (MAS- TER and one channel Volume Control up) Signal to Noise (20 Hz-20 kHz) . . . . . .Typica

7、lly 83 dB at maximum out- put with one channel Volume Control and MASTER Volume Control set at 8 (approximate- ly 58 dB gain) lnput Attenuation . . . . . . 0, 15 dB (switch-selected) lnput Clipping Level at 1 kHz: MIC lnput . . . . . . . . 100 mV (ATTENUATOR out; Ch. Volume at 2) 4.5 mV (ATTENUATOR

8、out; Ch. Volume at 12) 0.56V (ATTENUATOR in; Ch. Volume at 2) 25 mV (ATTENUATOR in; Ch. Vol- ume at 12) LlNE lnput . . . . . . . .33V (ATTENUATOR out; Ch. Vol- ume at 2) 1.35V (ATTENUATOR out; Ch. Volume at 12) 90V (ATTENUATOR in; Ch. Vol- ume at 2) 8.OV (ATTENUATOR in; Ch. Vol- ume at 12) lnput Com

9、mon Mode Rejection . . . . .I00 dB at 100 Hz Low-Frequency Equalization . . . . . . . . 213 dB at 100 Hz with respect to 0 (flat) setting High-Frequency Equalization . . . . . . . . 212 dB at 10 kHz with respect to 0 (flat) setting Tone Oscillator . . . . . . . . 1 kHz; less than 1% distortion; vari

10、able level lnput Impedance at 1 kHz: Microphone . . . .2.1 kilohms balanced (for use with 25- to 600-ohm microphones) Line (channels 7 and 8) . . . . . . . . . 66 kilohms balanced bridging Link lnput . . . . . .35 kilohms unbalanced Output Impedance: Program . . . . . . . Balanced line level: 120 oh

11、ms ac- tual (for use with 25- to 600- ohm inputs) Microphone level: 0.5 ohms ac- tual (for use with 25- to 600- ohm inputs) Measurement conditions: MIC input through 150 ohms, LINE input through 33 kilohms LINK INPUT through 600 ohms PROGRAM LlNE LEVEL terminated in 600 oh all other controls and swi

12、tches 0 or out. RadioFans.CN 收音机爱 好者资料库 SR109 Professional Mixer SPECIFICATIONS Headphones . .3.5 ohms actual (for use with 4- to 16-ohm headphones) Link . .600 ohms (actual) Accessory . Unbalanced aux level: 33 ohms actual (for use with 4K or higher loads) Limiter Threshold (adjustable) . .Typicall

13、y -20 to +20 dBm (at LlNE LEVEL output) Range . .Approximately 30 dB Link Jack System . External signal conditioning out- put/input; high-level auxiliary amplifier and tape recorder sig- nal output; multiple Mixer con- nection (common mix); remote master volume control VU Meter Calibration . 0, f4,

14、+8 dBm, switch-select- able (0.775, 1.23, 1.95 Vrms) at 1 kHz to 600-ohm load. VU RANGE Switch in 0 position provides 0 VU reading of 0 dBm (0.775 Vrms) to 600-ohm load1 . Phasing (polarity) .Pin 3 of INPUT connectors in phase with pin 9 of ACCESSO- RY OUTPUT, tips of LINK OUTPUT and PROGRAM LlNE LE

15、VEL OUTPUTS, and pin 3 of PROGRAM LlNE LEVEL and MIC LEVEL OUTPUTS (PHASE Switch in 0 position). Pins 1-8 of ACCESSORY OUTPUT out of phase with the above. . Phase Switch Output polarity-reversing switch (0, 180) (reverses phase of all program outputs) . 30 Vdc Bus .Pin 10 on ACCESSORY OUTPUT connect

16、or is regulated +30 k3.5 Vdc supply; pin 11 is ground (earth). May be used to power accessories up to 50 mA. . Operating Voltage .90-132 Vac, 50/60 Hz (SR109) 90-132, 180-250 Vac, 50/60 Hz (SR109-2E) Power Consumption . 20 watts max. (Mixer only). 500 watts max. (SWITCHED AC re- ceptacle) (SR109 onl

17、y) Temperature Range: . Operating - 7 O to 54OC (20 to 130F) . Storage .-29O to 71C (-20 to 160F) . Dimensions. 133 mm H x 483 mm W X 232 mm D (See Page 4.) (51/4 in. x 19 in. x 9% in.) Installation . Equipped for standard 19 in. (483 mm) rack mounting; 5% in. (133 mm) height; may be oper- ated in a

18、ccessory A105A Car- rying Case or in custom control center. . Weight 7.7 kg (17 Ib) . Finish Matte black, with beige write-on trim strip . Certifications Listed by Underwriters Labora- tories, Inc.; listed by Canadian Standards Association as cer- tified (SR109 only) RadioFans.CN 收音机爱 好者资料库 SR109 Pr

19、ofessional Mixer TABLE OF CONTENTS Section Page Section Page SPECIFICATIONS . ii. iii SERVICE INSTRUCTIONS DESCRIPTION . 1 Mixer Service 14 . OPERATING INSTRUCTIONS Functional Identification . 3 . General Operating Instructions 3 . Mounting and Ventilation 4 . Power Supply 5 Functional Circuit Descr

20、iption . 6 Inputchannels . 6 Monitor Mixer System . 6 . Program Mix Amplifier 7 Link Jacks . 7 Program Output . 7 . VU Meter Circuit 7 Limiter . 8 Tone Oscillator . 8 Basic Operating Hints . 8 . SPECIAL OPERATING INSTRUCTIONS High-Impedance Microphones . 9 Musical Instruments . 9 . Tape Recording 9

21、Record Playback . 10 Tape Playback . 11 Additional Mixer Inputs . 11 Additional Mixer Inputs (Two SRlO9s) . 12 Redundant Mixer Set-up (Two SRIO9s) . 12 Stereo Operation . 12 Remote Volume Control . 13 Telephone Line Surge Protection . 14 Replacement Parts . 14 Fuse Replacement . 14 Knob Replacement

22、. 14 Service Access . 14 Lamp Replacement . 14 Board Removal . 15 Limiter Internal Adjustment . 16 Overload Indicator Check . 16 VU Meter Removal . 16 VU Meter Calibration . 16 Parts Removal . 17 Transistor and Diode Removal . 17 Active Component Checking . 17 Service Illustrations . 18 Optional Acc

23、essories . 18 . REPLACEMENT PARTS LIST 19 NOTES TO CIRCUIT DIAGRAM . General 29 Troubleshooting . 29 Ac Voltage Measurements . 29 Dc Voltage Measurements . 30 Resistance Measurements . 30 . CONDENSED OPERATING INSTRUCTIONS 35 ARCHITECTS AND ENGINEERS SPECIFICATIONS . . 35 . GUARANTEE 35 . SHIPPING I

24、NSTRUCTIONS 35 SR109 Professional Mixer LlST OF ILLUSTRATIONS Figure Page . 1 SR109 Professional Mixer Front Panel 2 . 2 SR109 Professional Mixer Rear Panel 2 3 Overall Dimensions . 5 4 Block Diagram . 5 . 5 SR110 Monitor Mixer Applications 7 6 Tone Oscillator Applications . 8 7 Preamplifier-Mixer C

25、onnections . 9 8 Tape Recording . 10 9 Record Playback . 10 10 Tape Playback . 11 11 Additional Mixer Inputs . 11 12 Additional Inputs: Two SRIO9s . 12 Figure Page . 13 Redundant Mixers 13 . 14 Stereo Tape Recording 13 15 Remote Volume Control . 13 . 16 Printed Circuit Board and Parts Location 16 17

26、 Opto-Isolator Test . 17 18 Board 1: Preamplifier . 24 19 Board 2: Channel Equalizer . 25 20 Board 3: Main Board . 26 21 Board 9: Power Supply . 27 22 Board 0: Program Mute . 27 23 Lead Codes . 29 . 24 SR109-2E Power Supply Circuit Diagram 30 . 25 SR109 Professional Mixer Circuit Diagram .3 2-33 SR1

27、09 Professional Mixer DESCRIPTION The Shure Model SR109 Professional Mixer is a solid- state, eight-channel microphone mixer-preamplifier that enables the operator to mix as many as eight microphones with individual control over input attenuation, volume and high- and low-frequency equalization. The

28、 Mixer has three outputs: a program output, an accessory output and a headphone output. In addition, channels 7 and 8 contain switch-selectable inputs for use with either low-impedance microphones or line level sources. A master volume con- trol regulates program output. The program output has both

29、a 600-ohm, balanced line level output and a low-impedance, balanced, microphone output. The headphqne output is an all accessory equipment used with the Mixer should contain its own fuse. SR109-2E: The SR109-2E regulated power supply is designed to operate from either 90 to 132 volts ac or 180 to 25

30、0 volts ac, 50/60 Hz, as selected by the rear-panel VOLTAGE SELECTOR Switch (26). A three-conductor, grounded line cord supplies ac power to the Mixer through the front-panel POWER ON-OFF Switch (9). The SR109-2E line cord does not have a connector on the power source end of the cord. Obtain a suita

31、ble three-pin male ac connector and install it on the line cord: brown to hot or live terminal, blue lear to neutral terminal, and green/yellow lead to ground or earth terminal. (Con- nector should be installed by qualified service personnel.) The ac line is protected by a 0.1-ampere Slo-Blo fuse (f

32、or 180- to 250-volt operation) or a 0.2-ampere Slo-Blo fuse (for 90- to 132-volt operation. A wired-in 3/10-ampere fuse also protects the ac line. FUNCTIONAL CIRCUIT DESCRIPTION (See Figure 4, Page 5) Each three-pin professional audio input MICROPHONE LEVEL Connector (19) feeds its own low-impedance

33、 bal- anced lnput Transformer, which provides gain of 23 dB. Channels 7 and 8 also contain MIC/LINE Switches (20) which switch in a 50 dB bridging line-to-microphone level Attenuator to accept line-level inputs. The lnput Transformers (and, on channels 7 and 8, the MIC/LINE Switch) are fed to 15 dB

34、ATTENUATOR Switches (18) and then to the Preamplifier, which provides +7 to +42 dB gain. The amount of voltage gain provided by the Pre- amplifier (7 to 42 dB) is controlled by the Channel Volume Control (I), providing an increase in input clipping level as gain is reduced. The Preamplifier circuits

35、 contain the individual Channel Volume Controls and feed the indi- vidual Channel Equalizer (HI and LO FREQ EQ) Controls (3,2) which decrease the signal approximately 3 dB when set to the 0, or flat, setting. The Equalizer outputs are fed to the Program Mix Ampli- fier and the ACCESSORY OUTPUT Conne

36、ctor (17) for interconnection with SR110 Monitor Mixers. The Program Mix Amplifier feeds through a 560-ohm resistor to the LlNK jacks (21, 22). When accessory equipment is not connected to the LlNK jacks, the jacks are bypassed and the program signal is fed to the MASTER Volume Control (9) and back

37、to the ACCESSORY OUTPUT Connector. The output of the MASTER Volume Control, after feeding a 0 dB gain Amplifier, is sent to a Limiter Attenuator circuit. The attenuated signal feeds a limiter, which is connected to a Lamp Driver (for driving the LIMITER and OVERLOAD lamps) and a Limiter THRESHOLD AD

38、J Control (10) for setting the threshold of Limiter operation. Note that when the LIMITER Switch (11) is turned off (OUT), the LIMITER Lamp (4) will not light, but the OVERLOAD Lamp (5) will flash whenever the output clipping level is exceeded. The Limiter Attenuator also feeds a +7 to +35 dB output

39、 Amplifier, also controlled by the MASTER Volume Control. The signal then goes through a 0-180 PHASE Switch (15), and into the Program Output Transformer. The Trans- former feeds three LlNE LEVEL Output Connectors (23, 24) and a MIC LEVEL Output Connector (25), which is at 50 dB below line level. Th

40、e +7 to +35 dB output Ampli- fier also feeds the VU METER RANGE Switch (16), which goes to a +22 dB Meter Amplifier and then to the VU Meter (6), and a PHONES Level Control (7), Headphones Transformer and PHONES Output Jack (8). The Mixer also contains a 1 kHz Tone Generator for use in set-up and ch

41、eck-out. The Generator is activated and controlled by the channel 1 Volume Control/TONE OSC Switch (I), and the Control output is fed to the Preamplifier. A detailed description of the Mixer circuits and controls and their uses is provided in the following paragraphs of this section. INPUT CHANNELS

42、Eight professional, three-pin, audio MICROPHONE LEVEL lnput Connectors (19) are provided on the rear panel of the Mixer. The Mixer is designed to operate with high-quality, low-impedance dynamic, ribbon or condenser microphones. Each low impedance microphone input is connected to a low-impedance, ba

43、lanced-input transformer through a 15 dB input ATTENUATOR (18). Two MIC/LIINE Slide Switches (20) are provided for channels 7 and 8. These switches allow the user to select between either low-impedance MICROPHONE or LlNE LEVEL inputs. If additional line level inputs are required, Shure A15LA Line lnput Adapters may be used in each microphone level input. The 15 dB ATTENUATOR (18